diff --git a/www/mozilla-firefox/Makefile b/www/mozilla-firefox/Makefile
index 48dc6d3fbdd..cda90f9264e 100644
--- a/www/mozilla-firefox/Makefile
+++ b/www/mozilla-firefox/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.420 2020/04/22 14:05:47 landry Exp $
+# $OpenBSD: Makefile,v 1.421 2020/04/30 12:54:28 ratchov Exp $
 
 COMMENT =	Mozilla web browser
 ONLY_FOR_ARCHS =	amd64 i386 aarch64
@@ -9,7 +9,7 @@ MOZILLA_VERSION =	75.0
 MOZILLA_BRANCH =	release
 MOZILLA_PROJECT =	firefox
 MOZILLA_CODENAME =	browser
-REVISION =	0
+REVISION =	1
 
 WRKDIST =	${WRKDIR}/${MOZILLA_DIST}-${MOZILLA_DIST_VERSION:C/b[0-9]*//}
 HOMEPAGE =	https://www.mozilla.org/firefox/
diff --git a/www/mozilla-firefox/patches/patch-media_libcubeb_src_cubeb_sndio_c b/www/mozilla-firefox/patches/patch-media_libcubeb_src_cubeb_sndio_c
new file mode 100644
index 00000000000..81fe7c641dd
--- /dev/null
+++ b/www/mozilla-firefox/patches/patch-media_libcubeb_src_cubeb_sndio_c
@@ -0,0 +1,14 @@
+$OpenBSD: patch-media_libcubeb_src_cubeb_sndio_c,v 1.9 2020/04/30 12:54:28 ratchov Exp $
+
+Index: media/libcubeb/src/cubeb_sndio.c
+--- media/libcubeb/src/cubeb_sndio.c.orig
++++ media/libcubeb/src/cubeb_sndio.c
+@@ -626,7 +626,7 @@ sndio_enumerate_devices(cubeb *context, cubeb_device_t
+   device->preferred = CUBEB_DEVICE_PREF_ALL;
+   device->format = CUBEB_DEVICE_FMT_S16NE;
+   device->default_format = CUBEB_DEVICE_FMT_S16NE;
+-  device->max_channels = 16;
++  device->max_channels = (type == CUBEB_DEVICE_TYPE_INPUT) ? 2 : 8;
+   device->default_rate = 48000;
+   device->min_rate = 4000;
+   device->max_rate = 192000;